character: Professor Acoustics
topic: Wave Interference and Sound Quality
grade: 9
subject: Physics
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character: Dr. Harmonic
topic: Understanding Sound Waves
grade: 9
subject: Physics
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character: Ms. Echo
topic: Sound Reflection and Refraction
grade: 9
subject: Physics
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character: Mr. Frequency
topic: The Physics of Sound Frequency
grade: 9
subject: Physics
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